Two former Parramatta Eels players are accused of harbouring semi-automatic weapons and possessing more than half-a-million dollars in cash after dramatic arrests in Sydney's Centennial Park yesterday.

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"Poor governance creates opportunities for corruption when cultures allow sloppy behaviour, where dumb decision making is accepted and where poor legislation allows discretion to people who do not have the skills to administer intelligently."

The World Bank has estimated bribery costs about $1 trillion each year and about $40 billion a year is looted by corrupt political leaders.

Prof Graycar said where corruption existed it usually had a negative effect on the tone of government, the delivery of services and the distribution and equality of infrastructure.